Let’s get acquainted with the material calibration app on the 3DEXPERIENCE platform

An accurate material model is fundamental to correlate finite element analysis results to real-world test results. Understanding the Material Calibration app is important for the correlation of optimized material values, checking the fit of the curve and making the best use of FE-based calibration with physics simulations to make your simulation efficient and accurate.

If you are a Material Calibration Engineer or a Structural Mechanics Engineer or a Structural Analysis Engineer, this post will give an introduction to one of the most useful apps on the 3DEXPERIENCE platform for your role.

The Calibrations run using ABAQUS material models:

• ABAQUS possesses powerful capabilities to model advanced non-linear material models.
• These material models can be evaluated quickly without running a full finite element analysis. (FEA).
• Material models are generally represented by equations.

The tasks involved in defining an unknown material model for physics simulation include:

1. Testing
2. Calibration
3. Physics simulation

• FEA modeling and Simulation of the test specimen

• FEA modeling and simulation of the application

  

  Uniaxial Monotonic Tension Test

  A monotonic tension test is completed using a specimen designed to enforce uniaxial conditions at the center.

• The tensile force is gradually applied and elongation is measured (from which strain is calculated)
• Data points are recorded in terms of stress and strain and can be used to fit a mathematical model to the data.
• Quantities such as UTS and percent reduction in area (RA) can be calculated
• For steel at room temperature, the response is typically elastic until some yield point
• A loss of stiffness happens after the yield point, indicating that plasticity contributes to the nominal strain

• Any unloading after significant plasticity could lead to permanent deformation.

  

  Stress and Strain measures

• One usually imports nominal stress-strain data because this is how the data are typically measured.

  
• The material Calibration app will automatically apply all of the unit conversions necessary while executing the calibration.
• In the app, test and response data are plotted in nominal stress and strain measures, regardless of the imported Measures.
• Exported/saved materials are always stored in the measure by the solver.

  • For instance, true stress And true strain are used to define a tabular plasticity model.

    

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